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Commit d324236b authored by Wu Fengguang's avatar Wu Fengguang Committed by Andi Kleen
Browse files

memcg: add accessor to mem_cgroup.css 



So that an outside user can free the reference count grabbed by
try_get_mem_cgroup_from_page().

CC: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
CC: Hugh Dickins <hugh.dickins@tiscali.co.uk>
CC: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
CC: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: default avatarWu Fengguang <fengguang.wu@intel.com>
Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
parent e42d9d5d

include/linux/memcontrol.h

+7 −0
Original line number Diff line number Diff line
@@ -81,6 +81,8 @@ int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup) 
	return cgroup == mem;

}



extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem);



extern int

mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr);

extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
@@ -206,6 +208,11 @@ static inline int task_in_mem_cgroup(struct task_struct *task, 
	return 1;

}



static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)

{

	return NULL;

}



static inline int

mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)

{

mm/memcontrol.c

+5 −0
Original line number Diff line number Diff line
@@ -282,6 +282,11 @@ mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid) 
	return &mem->info.nodeinfo[nid]->zoneinfo[zid];

}



struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)

{

	return &mem->css;

}



static struct mem_cgroup_per_zone *

page_cgroup_zoneinfo(struct page_cgroup *pc)

{